I recently picked up a Cygolite Pace 200 for $69 on sale. Pretty happy with it so far. Light output is probably at the low end of what people are talking about here, but it's the strongest one I've had to date. Uses a USB rechargeable internal Lion battery. I don't see it on their site, so it must be a previous years model that was on clearance. The current Expilion series looks very similar.

I've also realized that if the manufacturer does not list the light output in lumens, it is just a be-seen light. Lumens don't tell everything, but they are at least the closest thing to an apples to apples comparison there is.